I swear I think my girls and I are in sync now.
They're testiness (in our house) usually lasts 2-4 days...I figure the longer amount is due to them hitting it a day or so off from the other. This week it was longer and they were much more vocal about it than at other times. Sometimes they'll just hiss a bit, get grouchy with each other and (gently) wrestle around during play time. This week, Lisle was hissing so loudly and constantly all night it sounded like someone standing in the middle of the house with a big squirt bottle. That and constant barking. On a normal night we hear a barking/song at around 4am. I had to close my bedroom door 4 nights in a row, which I really don't like to do because I like to keep an ear out for them...enjoy hearing them in the night. We just weren't going to get any sleep otherwise!